AN2753

Precision of the regulation and output voltage ripple

Doc ID 14654 Rev 2

21/31

Figure 23.

the secondary winding has been shorted. The short condition on the secondary winding

leads to high drain current. After two switching cycles, the system stops and continuous

running with high currents in the primary as well as in the secondary windings are avoided

Figure 24.

Operating with secondary winding shorted

3.6

Output overvoltage protection

Monitoring the voltage across the auxiliary winding during the MOSFET off time, through the

D2 diode and the resistor divider R3 and R14 (see Figure 2) connected to the CONT pin of

the VIPer17, allows the implementation of the output overvoltage protection. If the voltage

Test condition:

Full load before short

Test condition

Secondary winding

shorted